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Definition 2024

pearlite ‎(countable and uncountable, plural pearlites)

A two-phased lamellar structure composed of alternating layers of alpha ferrite and cementite that occurs in some steels and cast irons, having a pearlescent appearance.
(mineralogy) Alternative form of perlite
- 1835, British Association for the Advancement of Science
  […] inclosing great masses of pearlite and felspar.